ICE EFFECTS ON STREAMFLOW During winter, ice formation may cause stage
and discharge values to appear higher than expected. Ice effects may be
minor (occurring only at night and early morning) with baseline flows
obvious, or the effects may be major (stage constantly increases over
several days or weeks) resulting in greatly erroneous discharge.
Streamgages experiencing minor ice conditions will continue to display
stage and discharge values to enable users to estimate the approximate
base-line stage and discharge. Streamgages experiencing major ice
conditions will have the discharge record temporarily disabled to
prevent use of erroneous discharge values. The discharge record will
resume when it is determined that ice conditions are no longer present.
Daily mean discharges during periods of ice effect will be estimated
after detailed data analysis.

ICE EFFECTS ON STREAMFLOW During winter, ice formation in
streams can cause stage and corresponding discharge values to appear
higher than expected during periods of no precipitation. Ice effects
from partial ice cover or shore ice may be minor, where stage and
discharge appear to increase at night and decrease to base-line
conditions around midday for one or more days. Major ice effects from
complete ice cover appear as constantly increasing stage and discharge
over several days during prolonged cold periods. Stage and discharge
values for streams experiencing minor ice effects will continue to be
displayed on the web to enable the user to estimate the approximate
base-line discharges. Note that this method of estimation should only
be used when no runoff occurs. During periods of major ice effects,
display of discharge data on the web will be temporarily discontinued
to prevent misuse of erroneous discharge data. The discharge record
will resume when it is determined that ice conditions are no longer
present. Display of stage data during periods of minor and major ice
effects will continue to be displayed on the web. Daily mean discharges
will be estimated for all periods of ice-effected discharges.